1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef ASH_WM_WINDOW_RESIZER_H_ 6 #define ASH_WM_WINDOW_RESIZER_H_ 7 8 #include "ash/ash_export.h" 9 #include "ash/wm/drag_details.h" 10 #include "ash/wm/window_state.h" 11 #include "base/basictypes.h" 12 #include "base/memory/scoped_ptr.h" 13 #include "ui/gfx/rect.h" 14 #include "ui/wm/public/window_move_client.h" 15 16 namespace aura { 17 class Window; 18 } 19 20 namespace ash { 21 22 // WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving 23 // or resizing a window. All coordinates passed to this are in the parent 24 // windows coordinates. 25 class ASH_EXPORT WindowResizer { 26 public: 27 // Constants to identify the type of resize. 28 static const int kBoundsChange_None; 29 static const int kBoundsChange_Repositions; 30 static const int kBoundsChange_Resizes; 31 32 // Used to indicate which direction the resize occurs in. 33 static const int kBoundsChangeDirection_None; 34 static const int kBoundsChangeDirection_Horizontal; 35 static const int kBoundsChangeDirection_Vertical; 36 37 WindowResizer(); 38 WindowResizer(wm::WindowState* window_state); 39 virtual ~WindowResizer(); 40 41 // Returns a bitmask of the kBoundsChange_ values. 42 static int GetBoundsChangeForWindowComponent(int component); 43 44 // Returns a bitmask of the kBoundsChange_ values. 45 static int GetPositionChangeDirectionForWindowComponent(int window_component); 46 47 // Invoked to drag/move/resize the window. |location| is in the coordinates 48 // of the window supplied to the constructor. |event_flags| is the event 49 // flags from the event. 50 virtual void Drag(const gfx::Point& location, int event_flags) = 0; 51 52 // Invoked to complete the drag. 53 virtual void CompleteDrag() = 0; 54 55 // Reverts the drag. 56 virtual void RevertDrag() = 0; 57 58 // Returns the target window the resizer was created for. 59 aura::Window* GetTarget() const { 60 return window_state_ ? window_state_->window() : NULL; 61 } 62 63 // See comment for |DragDetails::initial_location_in_parent|. 64 const gfx::Point& GetInitialLocation() const { 65 return window_state_->drag_details()->initial_location_in_parent; 66 } 67 68 // Drag parameters established when drag starts. 69 const DragDetails& details() const { return *window_state_->drag_details(); } 70 71 protected: 72 gfx::Rect CalculateBoundsForDrag(const gfx::Point& location); 73 74 static bool IsBottomEdge(int component); 75 76 // WindowState of the drag target. 77 wm::WindowState* window_state_; 78 79 private: 80 // In case of touch resizing, adjusts deltas so that the border is positioned 81 // just under the touch point. 82 void AdjustDeltaForTouchResize(int* delta_x, int* delta_y); 83 84 // Returns the new origin of the window. The arguments are the difference 85 // between the current location and the initial location. 86 gfx::Point GetOriginForDrag(int delta_x, int delta_y); 87 88 // Returns the size of the window for the drag. 89 gfx::Size GetSizeForDrag(int* delta_x, int* delta_y); 90 91 // Returns the width of the window. 92 int GetWidthForDrag(int min_width, int* delta_x); 93 94 // Returns the height of the drag. 95 int GetHeightForDrag(int min_height, int* delta_y); 96 }; 97 98 // Creates a WindowResizer for |window|. This can return a scoped_ptr 99 // initialized with NULL if |window| should not be resized nor dragged. 100 ASH_EXPORT scoped_ptr<WindowResizer> CreateWindowResizer( 101 aura::Window* window, 102 const gfx::Point& point_in_parent, 103 int window_component, 104 aura::client::WindowMoveSource source); 105 106 } // namespace ash 107 108 #endif // ASH_WM_WINDOW_RESIZER_H_ 109
